Event: MID Stevenson Cup

Opponent Rating Result
Robert Springett 1646 ½ - ½
David A Page 1783 1 - 0
Alan E Riddoch 1784 ½ - ½
Robert E Lane 1776 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1847 = (6989 + 400 * (1 - 0)) / 4)

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